Check whether the string is a unix timestamp

Question

I have a string and I need to find out whether it is a unix timestamp or not, how can I do that effectively?

I found this thread via Google, but it doesn\'t come up

Answer 1

I came across the same question and created the following solution for my self, where I don't have to mess with regular expressions or messy if-clauses:

/**
 * @param string $string
 * @return bool
 */
public function isTimestamp($string)
{
    try {
        new DateTime('@' . $string);
    } catch(Exception $e) {
        return false;
    }
    return true;
}